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目的：本文探讨超声消融心室肌的可行性及作用特点。方法：用频率１０．４ＭＨｚ，外径７Ｆ的超声导管自开胸活体犬心外膜以不同时间和声强消融心肌，观察消融深度和形态结构特征；测量消融产生的温度变化。结果：消融深度与消融时间和声强呈良好相关，消融深度可达１０ｍｍ以上且边界清晰。当消融时间较长时，消融区近于圆形，而高声强短时间作用消融区呈椭圆形或矩形。消融中心温度可高达７８℃，而消融表面温度稍微增高。结论：超声可产生边清晰和深入的心肌消融，其消融深度和形状在一定程度上可控。提示超声可有效地消融心室肌深部病灶，为导管消融治疗室性快速心律提供新方法
Objective: This article explores the feasibility and role of ultrasound in the ablation of ventricular muscle. Methods: The heart was dissected from the epicardium of live-open canine dogs with frequency of 10.4MHz and external diameter of 7F to observe the ablation depth and morphological features of the myocardium with different time and intensity of sound. The temperature changes induced by ablation were measured. Results: The depth of ablation correlated well with the ablation time and intensity of sound. The ablation depth was up to 10 mm and the border was clear. When the ablation time is longer, the ablation zone is near the circle, while the ablation zone with the strong acuity and short time is oval or rectangular. The ablation center temperature can be as high as 78 ° C while the ablation surface temperature is slightly increased. CONCLUSIONS: Ultrasound produces clear and deep myocardial ablation while its ablation depth and shape are controllable to some extent. Tip ultrasound can effectively abate deep ventricular myenteric lesions for catheter ablation of ventricular tachycardia provides a new method